[R-390] Question

[nryan at mchsi.com]

Hi, Roger,

C-553 is located under the IF chassis in the section where the mechanical filters live.  It is a .01 mfd tubular paper-in-oil capacitor, nestled between L-505 and one of the bandwidth switch wafers.  One leg of this cap is connected to L-505, the other to a lug on said wafer.

Use a high quality replacement capacitor such as a Sprague orange drop, .01 mfd @600 VDC.  Before installing it, test the replacement capacitor for leakage, just to make sure.

73 de Norman, KG4SWM


----- Original Message -----
From: rkofler at aol.com
To: r-390 at mailman.qth.net
Sent: Fri, 22 Apr 2011 11:53:59 -0500 (CDT)
Subject: [R-390] Question

My R-390A is an EAC 1967 contract. Looking at the Y2K manual, chapter 
12 page 5, my IF sub-chassis appears to be the MOD 1 with the trimmers 
on top of the filters.

My question is: Looking at the drawing I don't see a C-553 listed. What 
capacitor am I supposed to change to protect the filters from getting 
zapped by the B+ ?

Thanks
Roger






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